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Physics

Physics
Light travels slowest in

Glass
Vacuum
Water
Air

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Physics
According to special theory of relativity the mass of a particle

Is independent of its velocity.
Decreases with decrease in velocity.
Increases with increase in velocity with respect to an observer.
Decreases with increase in velocity.

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Physics
The Laser is a beam of radiations which are

Coherent and non-monochromatic
Non-coherent and monochromatic
Non-coherent and non-monochromatic
Coherent and monochromatic

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Physics
An object of 10 kg is moving with a speed of 2 m/s. The kinetic energy of the object is

25 J
10 J
20 J
40 J

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Physics
An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:

0.6 units
600 units
6 units
60 units

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Physics
Sources of geothermal power are

Both A & B
Earth's heat
None of these
Water

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